There are no "Mini" AC units on the commercial market and no GPU/CPU combination on the market would make much use of any thing like it. This has been a subject asked before and you would have to enclose the entire PC to be somewhat effective. Considering the Electric you would waste and time rigging something up like this a good Liquid cooling loop would be far more efficient and effective. 40-43 ºC is optimal you have nothing to be concerned about unless your staying @65 ºC and above. GPU's will handle more heat some of them up to º80 ºC.